M-amidophenyl n-substituted carbamates

ABSTRACT

M-Amidophenyl N-substituted carbamates and their use as herbicides.

United States Patent 1 1 Hill et al.

[ 1 Apr. 8, 1975 [54] m-AMIDOPHENYL N-SUBSTITUTED C ARBAMATES [75] Inventors: Kenneth L. Hill, Middleport;

Kenneth R. Wilson, Tonawanda, both of NY.

[73] Assignee: FMC Corporation, New York, NY.

[22] Filed: Feb. 28, 1973 [21] Appl. No.: 336,786

Related U.S. Application Data [62] Division of Ser. No. 577,191. Sept. 6, 1966.

[52] U.S. Cl 260/479 C; 71/88; 71/94; 71/106; 260/2472 A; 260/2472 B; 260/293.77; 260/468 E [51] Int. Cl. C07c 69/76 [58] Field of Search 260/479 C, 468 E [56] References Cited UNITED STATES PATENTS 2,776,196 1/1957 Gysin et al. 260/479 FOREIGN PATENTS OR APPLICATIONS 554.576 3/1958 Canada 260/479 Primary E.\'aminerLorraine A. Weinberger Assistant E.\'aminer-Paul J. Killos 57 ABSTRACT m-Amidophenyl N-substituted carbamates and their use as herbicides.

22 Claims, No Drawings m-AMIDOPHENYL N-SUBSTITUTED CARBAMATES This is a division of application Ser. No. 577,191, filed Sep. 6, 1966.

This invention relates to novel herbicidal compounds, to new herbicidal compositions, and to a new method for the control of undesired plant growth, both pre-emergently and post-emergently, by application of said new and useful herbicidal compositions.

The novel herbicidal compounds of this invention are m-amidophenyl N-substituted carbamates of the following structure:

where is the residue of a primary or secondary amine of the formula l NII, Bo

and

is the residue of a carboxyiic acid l a ing at least two carbon atoms of the formula R CGQH. The substituents R and R may also form a heterocyciic ring with the carbarnate nitrogen, a morpholine or piperidine ring.

In one useful class of compounds, R and R are each aliphatic radicals, more preferably having up to about six catenated carbon atoms, which aliphatic radicals may be cyclic, straight chain or branched chain, saturated or unsaturated: R is preferably hydrogen but may be a lower alkyl group (e.g. methyl).

Examples of R and R aliphatic radicals are methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, isobutyl, tertbutyl, pentyl, neopentyl, isopentyl, l-methylbutyl, 2- methylbutyl, cyclohexyl, cyclopropyl, cyclopentyl, cyclobutyl, hexyl, l-methylpentyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, l, l, 2, 2 -tetramethylpropyl, 1,1-

dimethylbutyl, l, l -dimethylphentyl, 1,1 3- trimethylbutyl, l-ethylbutyl, l-ethylpentyl, chloroethyl, 3-chloropropyl, 2-chloropropyl, l-chloro-2- propyl, allyl, l-methylallyl, 2-butenyl, 3-butenyl, 2- propynyl, 1-methyl-2-propynyl and, particularly for R vinyl, propenyl, isopropenyl, l-butenyl, l-pentenyl, l-methyll -propenyl, 2-methyll -propenyl, l-methyll-butenyl, l-methyll -pentenyl, l ,B-dimethyll butenyl, l-ethylvinyl, l-ethyl-l-butenyl, ethynyl, lpropynyl, l-butynyl, and l-chlorobutyl and 1-chloro-lmethylbutyl.

Examples of R radicals, other than hydrogen, are methyl, ethyl, isopropyl, propyl and tert-butyl radicals In one preferred class of particularly active herbi cidal materials R is hydrogen and is the residue of a carboxylic acid in which the alphz carbon atom carries a methyl group. Here R may be for example, ethyl or l-methyl-butyl (which yield especially active products) or tert-butyl, l-methylpentyl o1 1,1-dimethylbutyl or isorpopyl. In another preferrec class, said alpha carbon is part of a cyclopropyl ring. Ir still another preferred class R is a l-propenyl radical The novel compounds of this invention may be prepared by methods employed for the synthesis of carbamates and/0r amides. For example, N monosubstituted-carbamic acid esters may be prepared by reacting an appropriate m-amido-phenol with an appropriate isocyanate. This reaction may be catalyzed by material: such as triethylamine, 1,4-diazabicyclo[2.2.2.]octane dibutyltin diacetatc, dimethyltin dichloride and dibutylbis (dodecylthio )tin. N,N-Disubstitutedand N- monosubstitutedcarbamic acid esters may be prepared by treating the sodium salt of an appropriate mamidophenol with an N-monosubstitutedo1 N,N-disubstituted-carbamoyl halide; another name f0] the 1,4-diazabicyclo [2.2.2] octane is triethylene diamine.

The intermediate m-amidophenols may be preparet by treatment of m-aminophenol with an acylating agen' such as an acyl halide, or an acid anhydride, or an ali phatic acid, to produce a 3-hydroxyanilide or a 3' hydroxy-N-substituted-anilide. A suitable acid accep tor is used to remove the acid by-product formed in th( reaction with an acyl halide or an acid anhydride, am a suitable drying agent is used to remove the wate: formed in the reaction with an aliphatic acid.

m-Jindtophenyl Nsubsttntedmara ates may alsr be prepared by first converting an appropriate m amidophenol to its chloroformic acid ester by treat ment with phoagene, then allowing the chloroformatg to react with a primary of secondary amine, includin the heterocyclic amines such as piperidine or morpho line.

Another method useful for the preparation of m amidophenyl N-substituted-carbamates involves thl treatment of a m-amiuophenyl N-substitutedo N,N-disubstituted-carbamate with an acyl halide or a1 anhydride, in the presence of a suitable acid acceptor Similarly, treatment of the appropriate m-aminopheny carbamate with an aliphatic acid will produce a m amidophenyl N-substitutedor N,N-disubstituted carbarnate; this reaction may be driven to completioi by removal of the volatile by-product or water. The in termediate m-aminophenyl N-substitutedo N,N-disubstituted-carbamates may be obtained by re duction of the corresponding m-nitrophenyl carba mates which, in turn, may be obtained by treatment 0 m-nitrophenol with an appropriate isocyanate, or witl an N-monosubstitutedor N,N-disubstituted carbamoyl halide. Useful m-nitrophenyl N-substituted carbamates may also be prepared by conversion of m nitrophenol to its chloroformic acid ester with phosgene and reaction of the m-nitrophenyl chloroforrnate with a primary or secondary amine.

Other methods useful for the preparation of mamidophenyl N-substituted-carbamates include the reaction of a m-amidophenol with an alkyl N-substitutedcarbamate or a N-substituted-urea, to yeild' mamidophenyl N-substituted-carbamate and an alcohol or ammonia, as described in US. Pat. No. 2,871,259. In these instances the reaction can be driven to completion by removal of the volatile by-product. Similarly, the exchange reaction between an aliphatic acid ester of a m-amidophenol and an alkyl N-substitutedcarbamate yields a m-amidophenyl N-substitutedcarbamate and an aliphatic acid ester; again the reaction may be driven to completion by removal of the volatile aliphatic acid ester.

These reactions of amines with acyl halides, acid anhydrides, acids and amines, and of phenols with phosgene, isocyanates, carbamoyl halides, and other reagents described hereinabove are well known in the art. For example, useful procedure for the preparation of carbamic acid esters are described by R. B. Wagener and H. D. Zook, Synthetic Organic Chemistry, Chp. 23, John Wiley and Sons, Inc., New York, 1953. The acylation of m-amionophenol with acid anhydrides is described by E. Felder and D. Petre, Farmaco (pavia) Ed. Sci. 15, 609-3l(l960).

Obviously the reactants selected will depend on the final product desired, as will the choice of synthetic procedure used. The m-amidophenyl carbamates thus produced are novel compounds, and are characterized by excellent herbicidal properties.

For herbicidal applications, the active mamidophenyl carbamates as above defined are formulated into herbicidal compositions by admixture, in herbicidally effective amounts, with the adjuvants and carriers normally employed for facilitating the dispersion of active ingredients for agricultural applications, recognizing the fact that the formulation and mode of application of a toxicant may affect the activity of the material in a given application. Thus, these active herbicidal compounds may be formulated as granules of relatively large particle size, as wettable powders, as emulsifiable concentrates, as powdery dusts, as solutions or as any of several other known types of formulations, depending on the desired mode of application. Preferred formulations for both preand post-emergence herbicidal applications are wettable powders, emulsifiable concentrates, and granules. These formulations may contain as little as 0.5 percent to as much as 95 percent or more by weight of active ingredient.

Wettable powders are in the form of finely divided particles which disperse readily in water or other dispersant. The wettable powder is ultimately applied to the soil or foilage as a dry dust or as a dispersion in water or other liquid. Typical carriers for wettable powders include fullers earth, kaolin clays, silicas and other readily wet organic or inorganic diluents. Wettable powders normally are prepared to contain about 5-95 percent of active ingredient by weight and usually also contain a small amount of a wetting, dispersing or emulsifying agent to facilitate Wetting and dispersion. For example, a useful wettable powder formulation contains 80.8 parts by weight of the m-amidophenyl carbamate, 17.9 parts by weight of kaolin clay, and 1.0 part by weight of sodium lignosulfonate and 0.3 part by weight of sulfonated aliphatic polyester as wetting agents.

Emulsifiable concentrates are homogeneous liquid compositions which are dispersible in water or other dispersant, and may consist entirely of the marnidophenyl carbamate with a liquid or solid emulsifying agent, or may also contain a liquid carrier, such as xylene, heavy aromatic naphthas, isophorone and other non-volatile organic solvents. For herbicidal application these concentrates are dispersed in water or other liquid carrier, and are normally applied as a spray to the area to be treated. The percentage by weight of the essential active ingredient may .vary according to the manner in which the composition is to be applied, but in general comprises 0.5 to percent of active ingredient by weight of the herbicidal composition. For example, a useful emulsifibable concentrate formulation contains 11.6 parts by weight of the m-amidophenyl carbamate, 57.7 parts by weight of cresol and 30.7 parts by weight of sulfated ethoxylated nonylphenol.

Granular formulations, wherein the toxicant is carried on relatively coarse particles, are usually applied without dilution to the area in which suppression of vegetation is desired. Typical carriers for granular formulations include sand, fullers earth, bcntonite clays, vermiculite, perlite and other organic or inorganic materials which absorb or which may be coated with the toxicant. Granular formulations normally are prepared to contain about 5-25 percent of active ingredient and may also contain small amounts of other ingredients which may include surface-active agents such as wetting agents, dispersing agents or emulsifiers; oils such as the heavy aromatic naphthas, kerosene or other petroleum fractions, vegetable oils; and/or stickers such as dextrins, glue or synthetic resins. The average particle size of the granules is usually between and 2400 microns. For example, a useful granular formulation contains 5.05 parts by weight of the m-amidophenyl carbamate, 5.00 parts by weight of corn oil and 89.95 parts by weight of crushed corncobs.

Typical wetting, dispersing or emulsifying agents used in agricultural formulations include, for example, the alkyl and alkylaryl sulfonates and sulfates and their sodium salts, polyhydric alcohols; and other types of surface-active agents, many of which are available in commerce. The surface-active agent, when used, normally comprises from 0.1 to 15 percent by weight of the herbicidal composition.

Dusts, which are free flowing admixture of the active ingredient with finely divided solids such as talc, clays, flours, and other organic and inorganic solids which act as dispersants and carriers for the toxicant, are useful formulations for soil-incorporated applications; the finely divided solids have an average particle size of less than about 50 microns.

Pastes, which are homogeneous suspensions of a finely divided solid toxicant in a liquid carrier such as water or oil, are employed for specific purposes. These formulations normally contain about 5-95 percent of active ingredient by weight, and may also contain small amounts of a wetting, dispersing or emulsifying agent to facilitate dispersion. For application, the pastes are normally diluted and applied as a spray to the area to be affected.

Other useful formulations for herbicidal applications include simple solutions of the active ingredient in a dispersant in which it is completely soluble at the desired concentration, such as acetone, alkylated naphthalenes, xylene or other organic solvents. Pressurized sprays, typically aerosols wherein the active ingredient is dispersed in finely divided form as a result of vaporization of a low boiling dispersant solvent carrier, such as the Freons, may also be used.

The preparation, properties, and herbicidal activity of representatives herbicidal compounds of this invention are illustrated further in the following examples, in which all temperatures are in degrees Centigrade.

In the following specific examples, which are given to illustrate this invention further, references will be made to tests of pre-emergence and post-emergence herbicidal activity on various plant species. The plant species used for the tests were chosen as representative of a broad spectrum of types of plants. In carrying out the tests there were used flat pans containing, to a depth of three inches, a 1:1 mixture of silt-loam and sandy-loam soils, and the seeds were planted to the depth indicated for the appropriate plant, taken from the following schedule:

Planting Depth Common Name Scientific Name (inches) Barnyard grass Echinochloa crusgalli A A Carrot Daucus carota A A Chickweed Cerastium vulgatum A A Corn Zea mays 1 Corn cockle Agrostemma Githago A A Cotton Gossypium hirsutum l Crabgrass Digitaria sanguinalis A Cucumber Cucumis sativus A /z Curly dock Rumex crispus A /2 Flax Linum usitatissimum A A German hay millet Setaria italica A A Giant foxtail Setaria magna A Va Lambsquarter Chenopodium album A A Lettuce Lactuca sativa A A Lima bean Phaseolus limensis l Meadow fescue Festuca elatior A A. Mustard Brassica juncea A A Oat Avena sativa A A Pea Pisum sativum 1 Peanut Arachis hypoqaca l Pigweed Amaranthus retroflexus A 6 Rice Oryza sativa A A Safflower Carthamus tinctorius A Soybean Glycine max 1 Sugar beet Beta vulgaris V4 A Tomato Lycopersicum esculentum A A Velvet leaf Abutilon theophrasti A Medic. Yellow foxtail Setaria glauca A A For the pre-emergence tests, as soon as the seeds were planted and the flats watered, the toxicant was sprayed on the soil as an acetone-water solution at the indicated rate, Both the treated flats and the untreated controls were held in the greenhouse for approximately two weeks, after which time the performance of the -toxicant was assessed in terms of percent kill with re spect to the untreated controls.

For the post-emergence tests, the flats were watered and the seed allowed to grow in the greenhouse for approximately 2 weeks. Maintaining untreated controls, the stand of plants was then sprayed with an aqueous acetone solution of the toxicant at the indicated rate. After a period of approximately 2 weeks, the number of surviving plants was observed, and the percent kill with respect to the untreated controls was estimated.

EXAMPLE 1 This example relates to m-( 2- methylvaleramido)phenyl methylcarbamate. The intermediate 3'-hydroxy-2-methylvaleranilide was prepared as follows: 2-Methylvaleryl chloride (13.5 g) was added dropwise to a solution of m-aminophenol (21.8 g) in 200 ml of dry acetonitrile, maintaining the temperature at 3540. The mixture was stirred for 2 hours, allowed to stand overnight, and the m-aminophenol hydrochloride removed by filtration. The filtrate was concentrated to dryness under reduced pressure to yield 18 g of 3-hydroxy-2-methylvaleranilide melting at l37.08.5. This product can be recrystallized from toluene or aqueous methanol.

Analysis: Calculated for C H NQ I C 69.54, H 8.27, N 6.76; Found: C 69.49, H 8.39, N 6.61.

Analysis: Calculated for C l-l N O C 63. Found: C 63.

On pre-emergence testing at a dosage of 8 pounds per acre, this compound showed percent kill of mustard and flax and severe damage to lettuce, carrots, crabgrass, corn, cotton and lima beans. On postemergence testing of this compound at a dosage of 8 pounds per acre there was 100 percent kill of mustard, lettuce, crabgrass, flax, lima beans, carrots and cotton;

corn and oats were so heavily damaged that death was expected.

EXAMPLE 2 This example relates to m-propionamidophenyl methylcarbamate. The intermediate m-aminophenyl methylcarbamate was prepared as follows: Methyl isocyanate (57 g) was added dropwise to a stirred solution of m-nitrophenol g) and triethylamine (10 drops) in 750 ml of ether and the solution was refluxed for 2 hours. The product, which precipitated out on cooling, was collected on a filter and washed thoroughly with ether. The crude m-nitrophenyl methylcarbamate was recrystallized from methanol to yield 67 g of solid melting at 133-5". To a solution of m-nitro-phenyl methylcarbamate (156.8 g) in 800 ml of ethyl acetate was added 0.8 g of platinum oxide catalyst. The solution was hydrogenated in a Parr hydrogenator. When the theoretical amount of hydrogen had been absorbed, the mixture was filtered to remove the catalyst, and the ethyl acetate was removed under reduced pressure. The residual oil solidified to yield 1 18 g of yellow solid. The crude m-aminophenyl methylcarbamate was recrystallized from benzene to melt at 92.5-4.5.

The product was reacted with propionyl chloride as follows: Propionyl chloride (7.0 g) was added dropwise to a solution of maminophenyl methylcarbamate (12.5 g) and triethylamine (7.0 g) in 150 ml of benzene. The mixture was refluxed for 1 hour, cooled and filtered. The solid was washed thoroughly with water to remove the triethylamine hydrochloride. The residual solid was recrystallized from aqueous methanol to yield 6.7 g of m-propionamidophenyl methylcarbamate melting at l56.58.0.

On pre-emergence testing of this compound at a dosage of 4 pounds per acre, 100 percent of mustard, German hay millet, crabgrass, chickweed and pigweed were killed. On post-emergence testing at a dosage of 4 pounds per acre, 100 percent of mustard, chickweed, and pigweed and 90 percent of the crabgrass were killed; German hay millet and the surviving crabgrass plants were so severely damaged that death appeared likely.

EXAMPLE 3 This example relates to m-isobutyramidophenyl methylcarbamate. Following the procedure described in Example 2, m-aminophenyl methylcarbamate was reacted with isobutyryl chloride to yield misobutyramidophenyl methylcarbamate melting at l62.0-4.5 on recrystallization from aqueous methanol.

Pre-emergence testing at a dosage of 4 pounds per acre resulted in 100 percent kill of mustard, chickweed and pigweed, and 90 percent kill of crabgrass (with the remaining plants severely damaged and expected to die); the large majority of German hay millet was also killed. Post-emergence testing at a dosage of 4 pounds per acre resulted in 100 percent kill of pigweed, mustard and chickweed, and moderate damage to German hay millet and crabgrass.

EXAMPLE 4 This example relates to m-(2- methylbutyramido)phenyl methylcarbamate. Following the procedure described in Example 2, maminoo s nyl me i. lea hamate was reacted with 2- methylbutyryl chloride to yield m-(2- methylbutyramido)phenyl methylcarbamate melting at l6l-3 on recrystallization from aqueous methanol.

Pre-emergence testing at a dosage of 4 pounds per acre resulted in 100 percent kill of mustard, chickweed and pigweed, and moderate damage to German hay millet and crabgrass. On post-emergence testing a dosage of 4 pounds per acre caused 100 percent kill of pigweed, and 90 percent kill of mustard, crabgrass and chickweed, and only slight damage to German hay millet.

EXAMPLE This example relates to m-pivalamidophenyl methylcarbamate. Following the procedure described in Example 2, m-aminophenyl methylcarbamate was reacted with pivaloyl chloride to yield m-pivalamidophenyl methylcarbamate melting at 179.080.5 on recrystallization from aqueous methanol.

On pre-emergence testing of this compound a dosage of 4 pounds per acre killed 100 percent of mustard, chickweed and pigweed, and caused moderate damage to German hay millet and crabgrass. On postemergence testing at a dosage of 4 pounds per acre,

100 percent of pigweed and chickweed, and the majority of mustard and crabgrass were killed, with only slight damage to German hay millet.

EXAMPLE 6 This example relates to m-crotonamidophenyl methylcarbamate. Following the procedure described in Example 2, m-aminophenyl methylcarbamate was reacted with crotonoyl chloride to yield 1. 1 crotonamidophenyl methylcarbamate melting at 142.0-4.5 on recrystallization from aqueous methanol.

Pre-emergence testing at a dosage of 4 pounds per acre resulted in 100 percent kill of mustard, pigweed and chickweed, 90 percent kill of crabgrass and percent kill of German hay millet.

EXAMPLE 7 per acre, 100 percent of mustard, crabgrass and chickweed were killed, as were percent of pigweed and 75 percent of German hay millet. On post-emergence testing at a dosage of 4 pounds per acre, 100 percent of mustard and chickweed were killed, as were 90 percent of crabgrass; German hay millet and pigweed were moderately damaged.

EXAMPLE 8 This example relates to m-(2- methylvaleramido)phenyl propylcarbamate. Following the procedure described in Example 7, 3-hydroxy-2- methylvaleranilide was reacted with propyl isocyanate to yield m--( Z-methylvaleramido)phenyl p-ropylearhamate melting at l64.05.5 on recrystallization from aqueous methanol.

On pre-emergence testing of this compound at a dosage of 4 pounds per acre, 100 percent of mustard, pigweed and chickweed, 90 percent of German hay millet and percent of crabgrass were killed. Postemergence testing at a dosage of 4 pounds per acre resulted in percent kill of mustard and chickweed and 50 percent kill of pigweed and crabgrass, with only slight damage to German hay millet.

EXAMPLE 9 This example relates to m-(2- methylvaleramido)phenyl butylcarbamate. Following the procedure described in Example 7, 3-hydroxy-2- methylvaleranilide was reacted with butyl isocyanate to yield m-(2-methylvaleramido)phenyl butylcarbamate melting at l546 on recrystallization from aqueous methanol.

Pre-emergence testing of this compound at a dosage of 4 pounds per acre resulted in 100 percent kill of mustard, chickweed and pigweed, 90 percent kill of German hay millet and 60 percent kill of crabgrass. Post-emergence testing at a dosage of 4 pounds per acre caused 100 percent kill of mustard and chickweed, with little or no damage to German hay millet, crabgrass and pigweed.

EXAMPLE This example relates to i m-( 2- methylvaleramido)phenyl isopropylcarbamate. Following the procedure described in Example 7, 3'-hydroxy- 2-methylvaleranilide was reacted with isopropyl isocyanate to yield m-(2-methylvaleramido)phenyl isopropylcarbamate melting at l846 on recrystallization from aqueous methanol.

Pre-emergence testing of this compound at a dosage of 4 pounds per acre resulted in 100 percent kill of mustard, lettuce, crabgrass, barnyard grass, chickweed and peanuts, and 75 percent kill of flax, moderate damage to German hay millet, and little or no damage to corn and cotton. Post-emergence testing at a dosage of 3 pounds per acre resulted in a 100 percent kill of lettuce and 90 percent kill of chickweed, moderate damage to mustard and little or no damage to German hay millet, barnyard grass and pigweed.

EXAMPLE 1 1 This example relates to m-(2-chloropropionamido)- phenyl methylcarbamate. The intermediate 2-chloro- 3'-hydroxypropionanilide (m.p. 157.5-8.5) was prepared from m-aminophenol and 2-chloropropionyl chloride following the procedure described in Example 1 for the preparation of 3 '-hydroxy-2- methylvaleranilide.

Following the procedure described in Example 7, 2- chloro-3'-hydroxypropionanilide was reacted with methyl isocyanate to yield m-(2-chloropropionamido)- phenyl methylcarbamate melting at l69.570.5 on recrystallization from aqueous methanol.

On pre-emergence testing of this compound a 4 pound per acre dosage killed 95 percent of pigweed and caused moderate damage to mustard, German hay millet, crabgrass and chickweed. Post-emergence testing at a 3 pound per acre dosage resulted in 90 percent kill of pigweed and 75 percent kill of lettuce, with little or no damage to mustard, German hay millet, barnyard grass and chickweed.

EXAMPLE 12 This example relates to m-(2,2-dimethylvaleramido)- phenyl methylcarbamate. The intermediate 3'- hydroxy-2,2-dimethylvaleranilide was prepared from m-aminophenol and 2,2-dimethylvaleryl chloride following the procedure described in Example 1 for the preparation of 3-hydroxy-2methylvaleranilide.

Following the procedure described in Example 7, 3'- hydroxy-2,2-dimethylvaleranilide was reacted with methyl isocyanate to yield m-(2,2-dimethylvaleramido)phenyl methylcarbamate melting at l48.550.5 on recrystallization from aqueous methanol.

Pre-emergence testing of this compound at a dosage of 4 pounds per acre resulted in 100 percent kill of mustard and pigweed, 95 percent kill of chickweed, 90 percent kill of crabgrass and 75 percent kill of German hay millet. Post-emergence testing ofthis compound at a dosage of 3 pounds per acre resulted in 100 percent kill of mustard, lettuce and chickweed, with slight to moderate damage to German hay millet, barnyard grass and pigweed.

EXAMPLE 13 This example relates to m-methacrylamidophenyl methylcarbamate. The intermediate 3-hydroxymethacrylanilide was prepared as follows: Methacryloyl chloride (l5.7 g) was added dropwise to a solution of maminophenyl (32.7 g) in 150 ml of acetonitrile, maintaining the temperature at 3540. The mixture was stirred for 2 hours, allowed to stand overnight and filtered. The solid was washed thoroughly with water to remove the m-aminophenol hydrochloride, and recrystallized from aqueous methanol to yield 17.5 g of 3'-hydroxymethacrylanilide melting at 178-80".

Following the procedure described in Example 7, 3'-hydroxymethacrylanilide was reacted with methyl isocyanate to yield m-methacrylamidophenyl methylcarbamate melting at l79-82 on recrystallization from methanol.

Pre-emergence testing of this compound at a dosage of 4 pounds per acre resulted in percent kill of mustard and pigweed, 70 percent kill of chickweed and 50 percent kill of German hay millet, with moderate damage to crabgrass and the surviving plants of the aforementioned species. Post-emergence testing of this compound at a dosage of 3 pounds per acre resulted in percent kill of lettuce and slight to moderate damage to mustard, German hay millet, barnyard grass, chickweed and pigweed.

EXAMPLE 14 This example relates to m-(Z-methyl-Z- pentenamido)phenyl methylcarbamate. The intermediate 3-hydroxy-2-methyl-Z-pentenanilide (crude m.p. 6976) was prepared from m-aminophenol and 2-methyl-2-pentenoyl chloride following the procedure described in Example I for the preparation of 3- hydroxy-2-methylvaleranilide.

Following the procedure described in Example 7, crude 3'-hydroxy-2-methyl-Z-pentenanilide was reacted with methyl isocyanate to yield m-(2-methyl-2- pentenamido)phenyl methylcarbamate melting at l66-9 on recrystallization from aqueous methanol.

Pre-emergence testing of this compound at a dosage of 4 pounds per acre resulted in 100 percent kill of mustard, chickweed and pigweed, 50 percent kill of German hay millet and 40 percent kill of crabgrass with moderate damage to the surviving plants. Postemergence testing of this compound at a dosage of 3 pounds per acre resulted in 100 percent kill of mustard, lettuce, chickweed, and pigweed, moderate damage to barnyard grass, but no injury to German hay millet.

EXAMPLE 15 This example relates to m-(2- methylvaleramido)phenyl dimethylcarbamate. To a stirred suspension of sodium hydride (2.7 g) in 100 ml of 1,2-dimethoxyethane, a solution of 3'-hydroxy-2- methylvaleranilide (20.7 g) in 50 ml of 1,2- dimethoxyethane was added dropwise. When the addition was complete and the evolution of hydrogen had ceased, the slurry was stirred at room temperature for one-half hour. Dimethylcarbamoyl chloride (11.9 g) was then-added dropwise and the mixture was allowed to stir overnight. The precipitated sodium chloride was removed by filtration and the filtrate was concentrated under reduced pressure to a yellow oil which crystallized on trituration with hexane to melt at 83.56.5.

Recrystallization from benzene-hexane gave 17.5 g of m-(2-methylvaleramido)phenyl dimethylcarbamate, melting at 84.5-7.0.

Pre-emergence testing of this compound at a dosage of 4 pounds per acre resulted in 100 percent kill of mustard, German hay millet and pigweed, and 95 percent kill of chickweed, and moderate damage to crabgrass. Post-emergence testing of this compound at a dosage of 3 pounds per acre resulted in 100 percent kill of lettuce and chickweed, and 75 percent kill of mustard, with little or no damage to German hay millet, barnyard grass and pigweed.

EXAMPLE 16 This example relates to m-(2- methylvaleramido)phenyl tert-butylcarbamate. tert- Butyl isocyanate (5.1 g) was added to a mixture of 3- hydroxy-2-methylvaleranilide (10.0 g) and triethylamine (5 drops). The reactants were mixed thoroughly by hand, and the flask was stoppered and heated in a water bath at 50 for 2 hours. The crude product was recrystallized from aqueous ethanol to yield 6.2 g of m-(2- methylvaleramido)phenyl tert-butyl-carbamate melting at 1524. A second recrystallization from aqueous ethanol raised the melting point to l534.

Analysis: Calculated for C H N O C 65.7 Found: C 65.6

The same product can be obtained using 1,4- diazobicyclo-[2.2.2]octane or dibutyltin diacetate as a catalyst in place of the triethylamine.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce and chickweed, 95 percent kill of German hay millet and 90 percent kill of barnyard grass and pigweed. Post-emergence testing of this compound at a dosage of 3 pounds per acre resulted in 100 percent kill of mustard, lettuce and chickweed and slight to moderate damage to German hay millet, barnyard grass and pigweed.

EXAMPLE 17 This example relates to m-acetamidophenyl methylcarbamate. Following the procedure described in Example l, a solution of 3'-hydroxyacetanilide in dioxane was reacted with methyl isocyanate in the presence of triethylamine catalyst. The m-acetamidophenyl methylcarbamate melted at 157.08.5 after recrystallization from ethanol.

Post-emergence testing of this compound at a dosage of 8 pounds per acre resulted in 100 percent kill of lettuce and 50 percent kill of mustard (with the surviving plants so badly damaged that their death appeared likely), without severe damage to lima beans, corn, cotton, crabgrass, flax, carrots and oats.

EXAMPLE 18 This example relates to m-propionamidophenyl tertbutylcarbamate. The intermediate 3-hydroxypropionanilide (m.p. l80l) was prepared from maminophenol and propionyl chloride following the procedure described in Example 1 for the preparation of 3 '-hydroxy-Z-methylvaleranilide. I

3-l-lydroxypropionanilide (16.5 g) was placed in a flask with triethylenediamine (1.12 g) and treated with 9.9 g of tert-butyl isocyanate. The reaction was stirred well and heated for 2 hours. Recrystallization from ethanol gave 10.4 g of m-propionamidophenyl tertbutylcarbamate melting at 1778.

Analysis: Calcd for C H N O C 63.61, H 7. Found: C 63.34, H 7.

In both preand postemergence testing of this compound, a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, German hay millet, barnyard grass, chickweed and pigweed.

EXAMPLE 19 This example relates to m-propionamidophenyl isopropylcarbamate. Following the procedure described in Example 7, 3-hydroxypropionanilide was reacted with isopropyl isocyanate and triethylamine to yield mpropionamidophenyl isopropylcarbamate melting at 173.5 on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, German hay millet, barnyard grass, chickweed and pigweed. In a post-emergence test on mustard, lettuce, German hay millet, crabgrass, flax and chickweed at a dosage of 6 pounds per acre, there was 100 percent kill of all species.

EXAMPLE 20 This example relates to m-propionamidophenyl isobutylcarbamate. Following the procedure described in Example 18, 3'-hydroxypropionanilide was reacted with isobutyl isocyanate and triethylenediamine to yield m-propionamidophenyl isobutylcarbamate melting at 171.52.5 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, percent and percent kill of lettuce and flax, respectively, with the remaining plants not expected to live, and moderate damage of crabgrass. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in percent kill of mustard and lettuce, 95 percent kill of carrots, 60 percent kill of flax, and moderate control of crabgrass.

EXAMPLE 21 This example relates to m-propionamidophenyl secbutylcarbamate. Following the procedure described in Example 18, 3-hydroxypropionanilide was reacted with sec-butyl isocyanate and triethylenediamine to yield m-propionamidophenyl sec-butylcarbamate melting at 174-6 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage.

of 6 pounds per acre resulted in 100 percent kill of mustard and flax, 90 percent kill of lettuce with severe injury to the surviving plants, and 95 percent kill of crabgrass with the remaining plants not expected to survive. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, flax, carrots and lettuce, and 95 percent kill of crabgrass with moderate injury to the surviving plants.

EXAMPLE 22 The example relates to m-(propionamido)phenyl allylcarbamate. Following the procedure described in Example 7, 3'-hydroxypropionanilide was reacted with allyl isocyanate and triethylamine to yield m- (propionamido)phenyl allylcarbamate melting at 1456 on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, German hay millet, flax, carrots and crabgrass, and 95 percent kill of lettuce with severe injury to surviving plants. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, German hay millet, flax, carrots, and crabgrass.

EXAMPLE 23 The example relates to m-propionamidophenyl (2-chloroethyl)-carbamate. Following the procedure described in Example 7, 3-hydroxypropionanilide was reacted with 2-ch1oroethyl isocyanate and triethylamine to yield m-propionamidophenyl (2-chloroethyl) carbamate melting at 165-6 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and lettuce, 95 percent kill of flax, 80 percent kill of barnyard grass, 70 percent kill of German hay millet, and 60 percent kill of crabgrass. In all cases of partial kill, the surviving plants were severely injured. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, crabgrass, German hay millet, flax and barnyard grass.

EXAMPLE 24 This example relates to m-propionamidophenyl cyclohexylcarbamate. Following the procedure described in Example 18, 3-hydroxypropionanilide was reacted with cyclohexyl isocyanate and triethylenediamine to yield m-propionamidophenyl cyclohexylcarbamate melting at l81-2.5 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre gave the following results: 100 percent kill of mustard, 95 percent kill of lettuce with severe injury to the surviving plants, moderate damage to flax, barnyard grass and crabgrass and only slight damage to German hay millet. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and lettuce, 95 percent kill of flax with remaining plants expected to die, and little or no effect on crabgrass and German hay millet.

EXAMPLE 25 This example relates to m-propionamidophenyl N,N-dimethylcarbamate. The intermediate sodium salt of 3-hydroxypropionanilide was prepared by reacting 3-hydroxypropionanilide (165 g).with methanolic sodium methoxide (obtained by dissolving sodium metal (23 g) in 1800 ml methanol). The solution was stirred for 1 hour at room temperature. Evaporation of the methanol left a sticky solid which was washed twice with benzene. Evaporation of the benzene left 123.4 g of the desired intermediate melting at 679.

Analysis: Calcd for c n N o z c 61.00, 11 6.83, N 11.86; Found: C 60.47, H 6.71, N 11.96.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and flax, 95 percent kill of lettuce with severe damage to the surviving plants, percent kill of German hay millet with severe damage to the surviving plants and severe damage to barnyard grass and crabgrass. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, crabgrass, flax and German hay millet, and percent kill of barnyard grass with the remaining plants not expected to survive.

EXAMPLE 26 This example relates to m-propionamidophenyl ethylcarbamate. Following the procedure described in Example 7, 3-hydroxypropionanilide was reacted with ethyl isocyanate and triethylamine to yield mpropionamidophenyl ethylcarbamate melting at 168-9 on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in percent kill of mustard, crabgrass, flax, Germany hay millet and barnyard grass, and 95 percent kill of lettuce with severe injury to surviving plants. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, crabgrass, flax, barnyard grass and German hay millet.

EXAMPLE 27 This example relates to m-propionamidophenyl propylcarbamate. Following the procedure described in Example 7, 3-hydroxypropionanilide was reacted with propyl isocyanate and triethylamine to yield mpropionamidophenyl propylcarbamate melting at l578 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, flax and German hay millet, and 90 percent kill of crabgrass and barnyard grass with severe injury to the surviving plants. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, crabgrass, barnyard grass, flax and German hay millet.

EXAMPLE 28 This example relates to m-propionamidophenyl hexylcarbamate. Following the procedure described in Example 7, 3'-hydroxypropionanilide was reacted with hexyl isocyanate and triethylamine to yield mpropionamidophenyl hexylcarbamate melting at 140.00.5 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and 95 percent kill of lettuce with the remaining plants not expected to survive, while German hay millet, crabgrass, barnyard grass and flax were undamaged. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and lettuce with little or no damage to flax, German hay millet, crabgrass and barnyard grass.

EXAMPLE 29 This example relates to m-propionamidophenyl 1,1,- 3,3-tetramethylbutylcarbamate. Following the procedure of Example 18, 3-hydroxypropionanilide was reacted with l,l,3,3-tetramethylbutyl isocyanate and triethylenediamine to yield m-propionamidophenyl 1,1,3- ,3-tetramethylbutylcarbamate melting at l35-6 on recrystallization from aqueous ethanol.

Pre-emergence and post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce and flax, while German hay millet, crabgrass and barnyard grass were undamaged.

EXAMPLE 30 This example relates to m-propionamidophenyl diisopropylcarbamate. The intermediate sodium salt of 3'-hydroxypropionanilide was prepared in the manner described in Example 25. Following the procedure used in the same example, this sodium salt was reacted with diisopropyl carbamoyl chloride to yield mpropionamidophenyl diisopropylcarbamate melting at l25.5-7.0 on recrystallization from aqueous methanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, flax and German hay millet, 90 percent kill of crabgrass with moderate damage to the surviving plants and moderate control of barnyard grass. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and lettuce, 80 percent kill of crabgrass with moderate damage to the surviving plants and moderate control of German hay millet.

EXAMPLE 3 1 This example relates to m-propionamidophenyl diethylcarbamate. Following the procedure of Example 25 the sodium salt of 3'-hydroxypropionanilide was reacted with diethyl carbamoyl chloride to yield mpropionamidophenyl diethylcarbamate melting at 85.6 on recrystallization from aqueous ethanol.

Pre-emergence testing with this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, barnyard grass, flax and German hay millet, 90 percent kill of lettuce with moderate injury to the surviving plants, and 80 percent kill of crabgrass with moderate injury to the surviving plants. Postemergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, crabgrass, barnyard grass, flax and German hay millet.

hydroxyisobutyranilide (m.p. l80l) was prepared from m-aminophenol and isobutyl chloride following the procedure described in Example 1 for the preparation of 3-hydroxy-Z-methylvaleranilide. Following the procedure described in Example 7 3 hydroxyisobutyranilide was reacted with isopropyl isocyanate and triethylamine to yield misobutyramidophenyl isopropylcarbamate melting at l79l 80 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of lettuce, percent kill of mustard and percent kill of chickweed with moderate injury to the remaining plants in both cases, 50 percent kill of pigweed, and moderate damage to German hay millet and barnyard grass. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 50 percent kill of lettuce with moderate injury to surviving plants and moderate injury to mustard, barnyard grass, chickweed and pigweed, with slight damage to German hay millet.

EXAMPLE 33 The example relates to m-isobutyramidophenyl tertbutylcarbamate. 3-Hydroxyisobutyranilide (17.9 g) was mixed well with l.l2 g of triethylenediamine and tert-butyl isocyanate (9.9 g) was added cautiously with stirring. The reaction was heated at 5060 for 2 hours. Recrystallization of the mixture from ethanol gave 8.5 g of m-isobutyramidophenyl tertbutylcarbamate melting at 178-9.

Analysis: Calc'd for C H N O C 64.72, H 7

Found: C 64.83, H 7.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in percent kill of mustard, lettuce, chickweed and pigweed, 70 percent kill of barnyard grass and moderate damage to German hay millet. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of chickweed, 95 and 75 percent kill of mustard and lettuce, respectively, with the remaining plants expected to die, and moderate damage to barnyard grass and pigweed.

EXAMPLE 34 The example relates to m-crotonamidophenyl isopropylcarbamate. The intermediate 3 hydroxycrotonanilide (m.p. l63-4) was prepared from m-aminophenol and crotonyl chloride following the procedure described in Example 1 for the preparation of 3'-hydroxy-2-methylvaleranilide. Following the procedure described in Example 18, 3'- hydroxycrotonanilide was reacted with isopropyl isocyanate and triethylamine to yield m-crotonamidophenyl isopropylcarbamate which melted at l73-4 on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, and chickweed, 95 percent kill of German hay millet, with remaining plants expected to die, moderate damage to barnyard grass and slight damage to pigweed. Post-emergence testing of this compound at a dosage of 8 pounds per acre resulted in 100 percent kill of mustard, lettuce, crabgrass, corn and lima beans.

allyl EXAMPLE 35 Thisexample relates to m-crotonamidophenyl tertbutylcarbamate. Following the procedure described in Example 18, 3 '-hydroxycrotonanilide was reacted with tert-butyl isocyanate and triethylenediamine to yield m-crotonamidophenyl tert-butylcarbamate melting at 207-8 on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, chickweed and pigweed, 95 percent kill of German hay millet with moderate damage to surviving plants, and 80 percent kill of barnyard grass with moderate injury to surviving plants. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, German hay millet and chickweed, and 95 percent kill of crabgrass with moderate injury to the remaining plants, and moderate damage to flax.

EXAMPLE 36 This example relates to m-crotonamidophenyl ethylcarbamate. Following the procedure described in Example 7, 3-hydroxycrotonanilide was reacted with ethyl isocyanate and triethylamine to yield mcrotonamidophenyl ethylcarbamate melting at l47-8 on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, flax and German hay millet, 90 percent kill of crabgrass with severe injury to the surviving plants, and 80 percent kill of barnyard grass with the remaining plants not expected to live. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, flax and lettuce, 90 percent kill of barnyard grass with the remaining plants not expected to live, 80 percent kill of German hay millet with the remaining plants not expected to live and 50 percent kill of crabgrass with moderate damage to surviving plants.

EXAMPLE 37 This example relates to m-crotonamidophenyl propylcarbamate. Following the procedure described in Example 7, 3-hydroxycrotonanilide was reacted with propyl isocyanate and triethylamine to yield mcrotonamidophenyl propylcarbamate melting at l678 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, crabgrass, lettuce and flax, 70 percent kill of German hay millet with moderate damage to surviving plants and moderate damage to barnyard grass. Postemergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and lettuce, 75 percent kill of German hay millet with moderate damage to surviving plants, 50 percent kill of crabgrass with moderate damage to surviving plants, slight control of barnyard grass and 80 percent kill of flax with the remaining plants expected to die.

EXAMPLE 38 This example relates to m-crotonamidophenyl allylcarbamate. Following the procedure described in Example 7, 3-hydroxycrotonanilide was reacted with isocyanate and triethylamine to yield mcrotonamidophenyl allylcarbamate melting at ISO-1 on recrystallization from ethanol.

' Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce and flax, 90 percent kill of crabgrass with severe injury to surviving plants, 90 percent kill of German hay millet with the remaining plants expected to die, percent kill of barnyard grass with moderate injury to surviving plants. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce and barnyard grass, percent kill of German hay millet with remaining plants not expected to live, 60 percent kill of crabgrass with moderate damage to the surviving plants, and 60 percent kill of flax with the remaining plants expected to die.

EXAMPLE 39 This example relates to m-crotonamidophenyl secbutylcarbamate. Following the procedure described in Example 18, 3-hydroxycrotonanilide was reacted with sec-butyl isocyanate and triethylenediamine to yield m-crotonamidophenyl sec-butylcarbamate melting at l989 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and flax, 95 percent kill of lettuce with severe injury to the surviving plants, 90 percent kill of crabgrass with moderate injury to the surviving plants, percent kill of German hay millet with moderate damage to the surviving plants and moderate damage to barnyard grass. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce and flax, 80 percent kill of German hay millet with the remaining plants not expected to live, and moderate control of crabgrass.

EXAMPLE 40 crotonamidophenyl dimethylcarbamate melting at 1.

Analysis: Calcd for C H N- o z C 62.80, H 6.50, N 11.28; 3 01, H 6.57, N 11.19.

Found: C 6

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 50 percent kill of lettuce with moderate damage to surviving plants and moderate control of mustard, crabgrass and German hay millet with little effect on barnyard grass. Postemergence testing of this compound at a dosage of 6 pounds per acre resulted in percent kill of mustard, 60 percent kill of lettuce with moderate damage to the surviving plants and slight control of crabgrass, with little effect on German hay millet and barnyard grass.

EXAMPLE 41 This example relates to m-butyramidophenyl methylcarbamate. The intermediate 3'-hydroxybutyranilide (m.p. l366.5) was prepared from m-aminophenol and butyryl chloride following the procedure described in Example 1 for the preparation of 3-hydroxy-2- methylvaleranilide. Following the procedure described in Example 7, 3-hydroxybutyranilide was reacted with methyl isocyanate and triethylamine to yield mbutyramidophenyl methylcarbamate melting at 1489 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, chickweed and pigweed and 40 percent kill of German hay millet with moderate damage to the surviving plants. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce and chickweed, 90 percent kill of pigweed with moderate injury to surviving plants and some kill of German hay millet and barnyard grass.

EXAMPLE 42 This example relates to m-valeramidophenyl methylcarbamate. The intermediate 3-hydroxyvaleranilide (m.p. ll5-6) was prepared from m-aminophenol and valeryl chloride following the procedure described in Example 1 for the preparation of 3'-hydroxy-2- methylvaleranilide. Following the procedure described in Example 7, 3-hydroxyvaleranilide was reacted with methyl isocyanate and triethylamine to yield m- (valeramido)phenyl methylcarbamate melting at l40-l on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and chickweed and 95 percent kill of lettuce with moderate damage to the surviving plants; German hay millet and barnyard grass were unaffected and pigweed was only slightly affected. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 95 percent kill of chickweed and 90 percent kill of mustard with moderate damage to the surviving plants in both cases; German hay millet, barnyard grass and pigweed were unaffected and lettuce was only slightly affected.

EXAMPLE 43 This example relates to m-hexanamidophenyl methylcarbamate. The intermediate 3'-hydroxyhexanilide (m.p. l356) was prepared from m-aminophenol and hexanoyl chloride following the procedure described in Example 1 for the preparation of 3'-hydroxy-2- methylvaleranilide. Following the procedure described in Example 7, 3'-hydroxyhexanilide was reacted with methyl isocyanate and triethylamine to yield mhexanamidophenyl methylcarbamate melting at l389 on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 90 percent kill of mustard and chickweed with moderate injury to surviving plants, while lettuce and pigweed were only slightly affected and German hay millet and barnyard grass were unaffected. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and 80 percent kill of chickweed with moderate damage to the surviving plants, while lettuce, German hay millet, crabgrass and pigweed were unaffected.

EXAMPLE 44 This example relates to m-(2,2-dimethylbutyramido)-phenyl methylcarbamidates The intermediate 3 '-hydroxy-2 ,Z-dimethylbutyranilide (m .p. 94-4.5) was prepared from m-aminophenol and 2,2-dimethylbutyryl chloride following the procedure described in Example 1 for the preparation of 3- hydroxy-2-methylvaleranilide. Following the procedure described in Example 7, 3'-hydroxy-2,2- dimethylbutyranilide was reacted with methyl isocyanate and triethylamine to yield m-(2,2-dimethylbutyramido)phenyl methylcarbamate melting at l50-l on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and chickweed and 95 percent kill of lettuce with the surviving plants not expected to live, and percent kill of pigweed with moderate damage to the surviving plants; German hay millet was moderately damaged and barnyard grass was only slightly damaged. Postemergence testing of this compound at a dosage of 6 pounds per acre resulted in 75 percent kill of mustard and lettuce with moderate injury to the surviving plants and 50 percent kill of pigweed with moderate damage to surviving plants and moderate control of chickweed, while barnyard grass was unaffected.

EXAMPLE 45 This example relates to m-( 2- methylcrotonamido)phenyl methylcarbamate. The intermediate 3'-hydroxy-2-methylcrotonanilide (m.p. l58.59) was prepared following the procedure described in Example 1 for the preparation of 3 '-hydroxy- 2-methylvaleranilide. Following the procedure described in Example 18 3 -hydroxy-2- methylcrotonanilide was reacted with methyl isocyanate and triethylamine to yield m-( 2- methylcrotonamido)phenyl methylcarbamate which melted at l55-6.5 on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce and chickweed, and percent kill of German hay millet and barnyard grass, respectively, with moderate damage to the surviving plants as well as moderate control of pigweed. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in percent kill of mustard and chickweed, 80 and 75 percent kill of barnyard grass and lettuce, respectively, with moderate damage to surviving plants and moderate control of pigweed.

EXAMPLE 46 solution treated three times with activated charcoal and the hexane removed under reduced pressure to leave 2-chloro-3-hydroxy-Z-methylvaleranilide, which did not crystallize. Following the procedure described in Example 7 2-chloro-3 -hydroxy-2- methylvaleranilide was reacted with methyl isocyanate and triethylamine to yield m-(2-chloro-2- metl1ylvaleramido)phenyl methylcarbamate which melted at l456 when recrystallized from ethanol.

Analysis: Calcd for C H, ClN O,-,: C 56.5 Found: C 56.4

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and chickweed, 90 percent kill of pigweed with moderate damage to the surviving plants, 80 percent kill of lettuce with severe injury to surviving plants, 75 percent kill of German hay millet with moderate damage to surviving plants, and moderate damage to barnyard grass. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and lettuce, and slight to moderate damage to German hay millet and pigweed.

EXAMPLE 47 This example relates to m-( 2- methylvaleramido)phenyl isobutylcarbamate. The intermediate 3-hydroxy-2-methyl valeranilide (137.0-8.5) was prepared from m-aminophenol and 2-methylvaleryl chloride following the procedure described in Example 1 for the preparation of this same intermediate. Following the procedure described in Example 18, 3-hydroxy-2-methylvaleranilide was reacted with isobutyl isocyanate and triethylenediamine to yield m-(2-methylvaleramido)phenyl isobutylcarbamate melting at 156-7" on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce and chickweed, 95 percent kill of pigweed, 80 percent kill of barnyard grass and 60 percent kill of German hay millet. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, 95 percent kill of lettuce with surviving plants not expected to live, 50 percent kill of chickweed with slight injury to the surviving plants and moderate control of German hay millet; flax was slightly damaged and crabgrass was unaffected.

EXAMPLE 48 Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of 'mustard and lettuce and percent kill of barnyard grass and flax with the remaining plants not expected to survive; German hay millet and crabgrass were moderately damaged.

EXAMPLE 49 This example relates to m-( 2- methylvaleramido )phenyl diisopropylcarbamate.

Diisopropylcarbamoyl chloride (16.4 g) was added dropwise to a slurry of the sodium salt of 3- hydroxyvaleranilide (22.9 g) prepared by the method of Example 25, in 250 ml of acetonitrile. The mixture was stirred for 21 hours and filtered to recover 5.2 g of sodium chloride. The solvent was removed from the filtrate in vacuo to give 23.4 g of a light yellow oil, con- Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, 90 percent kill of lettuce and German hay millet with moderate damage to the surviving plants, percent kill of crabgrass with the remaining plants not expected to live aand 80 percent kill of flax with moderate damage to surviving plants; barnyard grass was only slightly affected. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 90 percent kill of mustard with the remaining plants not expected to survive, 75 percent kill of lettuce with moderate damage to the surviving plants and moderate damage to flax; German hay millet, crabgrass and barnyard grass were unaffected.

EXAMPLE 50 This example relates to m-[ 2- cyclopropylacetamido]phenyl tert-butylcarbamate. A mixture of 3'-hydroxy-2-cyclopropylacetanilide (10.7 g), triethylamine (9 g) and tert-butyl isocyanate (6 g) in 50 m1 of dimethylformamide was heated at 70 for 24 hours. The solution was cooled to room temperature, filtered and poured into 400 m1 of cold water. The solid which separated was isolated and found identical to that separated initially. Recrystallization of the combined solids from aqueous ethanol gave 8.6 g of m-[2- cyclopropylacetamido]phenyl tert-butylcarbamate, m.p. 213.0-2l3.5.

Analysis: Calcd for C, H N O C 65.19, H 7.3

Found: C 65.15, H 7.0

Both pre-emergence and post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in percent kill of mustard, lettuce, crabgrass, barnyard grass, German hay millet and flax.

EXAMPLE 5 1 This example relates to m-( 2- methylvaleramido )phenyl sec-butylcarbamate. Following the procedure described in Example 18, 3'- hydroxy-2-methylvaleranilide was reacted with secbutylcarbamate melting at l72-4 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, 70 percent kill of flax, and moderate control of lettuce and crabgrass. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in moderate control of mustard and crabgrass, 50 percent kill of flax and slight damage to carrots.

EXAMPLE 52 This example relates to m-(Z- chlorovaleramido)phenyl methylcarbamate. The intermediate 2-chloro-3 -hydroxyvaleranilide, m.p. l20.0-l2 1 .5, was prepared from m-aminophenol and 2-chlorovaleroyl chloride by the procedure described in Example 1 for the preparation of 3'-hydroxy-2- methylvaleranilide.

Analysis:

Calc'd for c,,H,,c1No,; c 58.02, H 6.15, N 6.15, CI l5.62; Found: c 58.37, H 6.34, N 6.18, CI l4.l9.

Following the procedure of Example 7, 2-chloro-3- hydroxyvaleranilide was reacted with methyl isocyanate to yield m-(2-chlorovaleramido)phenyl methylcarbamate, which melted at 143.0l44.5 on recrystallization from aqueous ethanol.

Analysis: Calcd for C,,H,,C1N,0,= C 54.8 Found: C 54.6

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, crabgrass and chickweed and 90 and 60 percent kill of flax and German hay millet, respectively, with moderate damage to the surviving plants. Post-emergence testing of this compound at 6 pounds per acre resulted in 100 percent kill of lettuce and crabgrass, 95 percent kill of mustard with moderate injury to surviving plants, 95 percent kill of German hay millet with the remaining plants expected to die, 70 percent kill of chickweed, and 80% kill of flax.

EXAMPLE 53 This example relates to m-(2,2-dimethylvaleramido) phenyl isopropylcarbamate. The intermediate 3- hydroxy-2,Z-dimethylvaleranilide was prepared from m-aminophenol and 2,2-dimethylvaleryl chloride following the procedure described in Example 46. Again the oil did not crystallize.

Analysis: Calcd for C l-l NO C 70.55, H 8. Found: C 70.85, H 8.

Following the procedure described in Example 7, the intermediate was reacted with isopropyl isocyanate and 24 triethylenediamine to yield m-(2,2-dimethylvaleramido)phenyl isopropylcarbamate melting at 140l on recrystallization from aqueous ethanol.

Analysis: Calcd for C H N O C 66.64, H 8.55

Found: C 66.51 H 8.68,

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, flax and lettuce and 95 percent kill of carabgrass with moderate injury to the surviving plants. Postemergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, flax and lettuce and 90 and percent kill of carrots and crabgrass, respectively, with moderate injury to the surviving plants.

EXAMPLE 54 testing of this compound at a dosage of 6 pounds per' acre resulted in a 100 percent kill of mustard, flax and lettuce and an percent kill of crabgrass with moderate injury to the surviving plants.

EXAMPLE 55 This example relates to m-(2-methylhexanamido)- phenyl methylcarbamate. The intermediate 3'- hydroxy-Z-methylhexananilide was prepared by reaction of 2-methylhexanoyl chloride and m-aminophenol using the procedure of Example 1. Following the procedure described in Example 7, 3'-hydroxy-2- methylhexananilide was reacted with methyl isocyanate and triethylamine to yield m-(Z-methylhexanamido)-phenyl methylcarbamate melting at 159-60 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in a 100 percent kill of mustard and flax and percent kill of lettuce with severe injury to surviving plants and 95 percent kill of crabgrass with moderate damage to the surviving plants. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 95 percent kill of lettuce and flax with severe damage to the surviving plants and 95 percent kill of mustard with moderate injury to surviving plants; barnyard grass and carrots were moderately damaged.

EXAMPLE 56 This example relates to m-(3-methyl-2- butenamido)phenyl methylcarbamate. The intermediate 3'-hydroxy-3-methyl-2-butenanilide (m.p. l567) was prepared from m-aminophenol and 3-methyl-2- butenoyl chloride following the procedure described in Example 1 for the preparation of 3'-hydroxy-2- methylvaleranilide. Following the procedure described in Example 7, 3'hydroxy-3-methyl-2-butenanilide was reacted with methyl isocyanate and triethylamine to yield m-(3-methyl-2-butenamido) phenyl methylcarbamate melting at l68l72 on recrystallization from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of flax, 95 percent kill of mustard with moderate damage to the surviving plants, 95 percent kill of lettuce with severe injury to the surviving plants and 60 percent kill of crabgrass with moderate damage to surviving plants. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, flax and carrots and 90 percent kill of crabgrass with moderate injury to the surviving plants.

EXAMPLE 57 This example relates to m-acrylamidophenyl methylcarbamate. The intermediate 3-hydroxyacrylanilide (m.p. l645) was prepared from m-aminophenol and acryloyl chloride preparation of 3-hydroxy-2- methylvaleranilide. Following the procedure described in Example 7, 3-hydroxyacrylanilide was reacted with methyl isocyanate and triethylamine to yield macrylamidophenyl methylcarbamate, melting at 177-8 on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, flax and lettuce, 80 percent kill of German hay millet and severe injury to surviving plants, and severe damage to crabgrass. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, German hay millet, crabgrass and flax.

EXAMPLE 58 This example relates to m-acrylamidophenyl ethylcarbamate. Following the procedure described in Example 7, 3'-hydroxyacrylanilide was reacted with ethyl isocyanate and triethylamine to yield macrylamidophenyl ethylcarbamate melting at l645 on recrystallizationn from aqueous ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce and crabgrass, 95 percent kill of German hay millet with the remaining plants not expected to survive, 90 percent kill of flax and moderate control of barnyard grass. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard and lettuce, and slight to moderate damage to German hay millet, crabgrass, barnyard grass and flax.

EXAMPLE 59 This example relates to m-acrylamidophenyl isopropylcarbamate. Following the procedure described in Example 7, 3'-hydroxyacrylanilide was reacted with isopropyl isocyanate and triethylamine of yield macrylamidophenyl isopropylcarbamate melting at ZOO-1 on recrystallization from ethanol.

Pre-emergence testing of this compound ata dosage of 6 pounds per acre resulted in '100 percent kill of lettuce, 80 percent kill of mustard withmoderate injury to the surviving plants and'moderate control of German hay millet, crabgrass and flax. Postemergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of lettuce, moderate damage to flax and mustard, and only slight damage to German hay millet, crabgrass and barnyard grass.

EXAMPLE This example relates to m-acrylamidophenyl tertbutylcarbamate. Following the procedure described in Example 18, 3-hydroxyacrylanilide was reacted with tertbutyl isocyanate and triethylenediamine to yield macrylamidophenyl tert-butylcarbamate melting at 204-5on recrystallization from ethanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of lettuce, 90 percent kill of flax, 50 percent kill of mustard with remaining plants expected to die, and moderate control of crabgrass and German hay millet; barnyard grass was moderately damaged. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of lettuce, percent of flax with the remaining plants expected to die and moderate damage to mustard, barnyard grass, German hay millet and crabgrass.

EXAMPLE 61 This example relates to m-(cyclopropylcarbonylamino)-phenyl methylcarbamate. The intermediate 3-hydroxy(cyclopropyl)carboxanilide (m.p. l82-3) was prepared from m-aminophenol and cyclopropylcarbonyl chloride following the procedure described in Example 1. Following the procedure described in Example 7, 3-hydroxy(cyclopropyl)carboxanilide was reacted with methyl isocyanate and triethylamine to yield m-(cyclopropyl-carbonylamino) phenyl methylcarbamate melting at 19 l2 on recrystallization from methanol.

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, lettuce, German hay millet, crabgrass, barnyard grass and flax. Post-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of lettuce, flax and mustard, percent kill of crabgrass with moderate injury to the surviving plants and 75 percent kill of barnyard grass with the remaining plants not expected to live; German hay millet was so damaged that it was not expected that the plants would live.

EXAMPLE 62 This example relates to m-(2-methylpropionamido)- phenyl dimethylcarbamate. The intermediate maminophenyl dimethylcarbamate was prepared as follows: m-nitrophenol g) was added gradually to a mixture of sodium methoxide (38.8 g) and methanol; the mixture was then heated at 60 for 2 hours and the methanol evaporated to obtain 120.9 g of the sodium salt of m-nitrophenol. Dimethylcarbamoyl chloride (79.0 g) was added dropwise to a suspension of the sodium salt of m-nitrophenol g) in dioxane (600 cc). The reaction mixture was heated at 605 for 2 hours and allowed to stir at room temperature overnight. The mixture was diluted with several volumes of water and the oil was washed several times with M 0 to obtain 1 10.5 g of m-nitrophenyl dimethylcarbamate melting at 55-7. This carbamate was dissolved in ethyl acetate cc), 1 g of platinum oxide was added and the mixture reduced on a Parr l-lydrogenator until hydrogen absorption ceased. The platinum oxide was removed by filtration and ethyl acetate was evaporated under reduced pressure to yield 3-aminophenyl dimethylcarbamate which melted at 8990.5.

Isobutyryl chloride (9.0 g) was added to a solution of m-aminophenyl dimethylcarbamate (15.0 g) and triethylamine (8.6 g) in 125 ml of benzene maintained at 60. The solution was stirred for 3 hours at 60, then cooled and filtered. The filtrate was cooled to 6- and washed with 10 percent hydrochloric acid and water. The organic layer was dried over magnesium sulfate, and the solvent was removed in vacuo to give 16.4 g of a cream colored solid. Recrystallization from benzenehexane gave 14.2 g of m-(Z-methylpropionamido)phenyl dimethylcarbamate, m.p. ll9l20.

Analysis: Calcd for C H N O C 62.38 H Found: C 62.67, H

Pre-emergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of mustard, 95 percent 90 percent and 95 percent kill of German hay millet, crabgrass and flax, respectively, with moderate damage to the surviving plants; barnyard grass and lettuce was moderately damaged. Postemergence testing of this compound at a dosage of 6 pounds per acre resulted in 100 percent kill of lettuce and mustard, 80 percent kill of flax with the remaining plants expected to die; German hay millet, crabgrass and barnyard grass were moderately damaged.

Other examples of compounds falling within the generic formulas presented herein, which may be formulated into herbicidal compositions and applied as herein illustrated are:

m-(Z-Methylhexanamido)phenyl methylcarbamate m-(2,2,4-Trimethylvaleramido)phenyl methylcarbamate m-Z-Pentenamidophenyl methylcarbamate m-Propiolamidophenyl methylcarbamate m-( 2-Methylvaleramido)phenyl diethylcarbamate m-Methacrylamidophenyl isopropylcarbamate m-Methacrylamidophenyl tert-butylcarbamate m-Cyclohexanecarboxamidophenyl methylcarbamate m-(4-Methylvaleramido)phenyl methylcarbamate m-Propionamidophenyl 2-buten-l-ylcarbamate m-Propionamidophenyl methyl tert-butylcarbamate m-Propionamiodphenyl l-chloro-2-propylcarbamate m-Butyramidophenyl isobutylcarbamate m-Butyramidophenyl isopropylcarbamate m-Butyramidophenyl tert-butylcarbamate m-Butyramidophenyl Z-chloroethylcarbamate m-Butyramidophenyl diethylcarbamate m-Butyramidophenyl methyl tert-butylcarbamate m-Isobutyramidophenyl ethylcarbamate m-lsobutyramidophenyl 2-chloroethylcarbamate m-lsobutyramidophenyl 2-buten-l-yl carbamate m-Isobutyramidophenyl diethylcarbamate m-Valeramidophenyl propylcarbamate m-Valeramidophenyl cert-butylcarbamate m-Valeramidophenyl 2-chloroethylcarbamate m-( Z-Methylbutyramido )phenyl propylcarbamate m-( 2-Methylbutyramido )phenyl butylcarbamate m-( 2-Methylbutyramido )phenyl tert-butylcarbamate m-(Cyclopropylcarbonylamino)phenyl 2-chloroethylcarbanate 28 m-(Cyclopropylcarbonylamino)phenyl 2-buten-l -yl carbamate m-(Cyclopropylcarbonylamino)phenyl methyl tertbutylcarbamate m-(Cyclopropylcarbonylamino)phenyl propylcarbamate m-(2-Methylvaleramido)phenyl 2-chloroethylcarbamate l-chloro-2- m-(2-Methylvaleramido)phenyl 2-buten-l-yl carbamate m-( Z-Methylvaleramido )phenyl l-chloro-2- propylcarbamate m-Pivalamidophenyl ten-butylcarbamate m-Crotonamidophenyl 2-chloroethylcarbamate M-Crotonamidophenyl diethylcarbarmate m-Crotonamidophenyl l-chloro-2-propylcarbamate m-(2-Chloropropionamido)phenyl ethylcarbamate m-(2-Chloropropionamido)phenyl isopropylcarbamate m-(2-Chloropropionamido)phenyl tertbutylcarbamate m-( Z-Chloropropionamido )phenyl isopentylcarbamate m-(2-Chloropropionamido)phenyl 2-chloroethylcarbamate m-(2-Chloropropionamido)phenyl 2-buten-1-yl carbamate m-(2-Chloropropionamido)phenyl diethylcarbamate m-(2,2-Dimethylvaleramido)phenyl sec-pentylcarbamate m-(2,2-Dimethylvaleramido)phenyl 2-chloroethylcarbamate m-( 2,2-Dimethylvaleramido )phenyl Z-buten- 1 -yl carbamate m-(2,2-Dimethylvaleramido)phenyl dimethylcarbamate m-Methacrylamidophenyl isopropylcarbamate m-Methacrylamidophenyl tert-butylcarbamate m-Methacrylamidophenyl 2,2-dimethylpropylcarbamate m-Methacrylamidophenyl allylcarbamate m-Methacrylamidophenyl 2-chloroethylcarbamate m-Methacrylamidophenyl diethylcarbamate m-(2-Methyl-2-pentenamido)phenyl isopropylcarbamate m-(2-Methyl-2-pentenamido)phenyl butylcarbamate m-(2-Methyl-2-pentenamido)phenyl allylcarbamate m-(Z-Methyl-Z-pentenamido)phenyl 2-chloroethyltertcarbamate m-( 2-Methyl-2-pentenamido)phenyl 2-butenl -yl carbamate m-(2-Methyl-2-pentenamido)phenyl dimethylcarbamate tert- 29 m-(2,2-Dimethylbutyramido)phenyl 2-chloroethylcarbamate m-( Z-Methylcrotonamido )phenyl isopropylcarbamate m-(2-Methylcrotonamido)phenyl tertbutylcarbamate m-(Z-Methylcrotonamido)phenyl 2-chloroethylcarbamate m-(2-Chloro-2-methylvaleramido)phenyl isopropylcarbamate m-(2-Chloro-Z-methylvaleramido)phenyl butylcarbamate m-(2-Chloro-2-methylvaleramido)phenyl 2-chloroethylcarbamate m-(2-Chloro-2-fnethylvaleramido)phenyl diethylcarbamate m-(2-Chlorovaleramido)phenyl isopropylcarbamate m-(2-Chlorovaleramido)phenyl tert-butylcarbamate m-(2-Chlorovaleramido)phenyl 2-chloroethylcarbamate m-(Z-Methylhexanamido)phenyl mate m-(Z-Methylhexanamido)phenyl diethylcarbamate m-(2-Methylhexanamido)phenyl tertbutylcarbamate m-(2-Methylhexanamido)phenyl bamate m-(3,3-Dimethylacrylamido)phenyl ethylcarbamate m-(3,3-Dimethylacrylamido)phenyl dimethylcarbamate m-(3,3-Dimethylacrylamido)phenyl isopropylcarbamate tertisopropylcarba- 2-chloroethylcarm-( 3,3-Dimethylacrylamido)phenyl tertbutylcarbamate m-(3,3-Dimethylacrylamido)phenyl 2-chloroethylcarbamate m-Acrylamidophenyl dimethylcarbamate m-Acrylamidophenyl 2-chloroethylcarbamate m-(2-Chlorobutyramido)phenyl methylcarbamate m-(2-Chlorobutyramido)phenyl tert-butylcarbamate m-( 2-Chlorobutyramido )phenyl dimethylcarbamate m-(Z-Chlorobutyramido)phenyl dimethylcarbamate m-(2-Chloro-2-methylpropionamido)phenyl methylcarbamate m-( 2-Chloro-2-methylpropionamido )phenyl ethylcarbamate m-( 2-Chloro-2-methylpropionamide )phenyl isopropylcarbamate m-( 2-Chloro-2-methylpropionamido)phenyl tertbutylcarbamate m-(2-Chloro-2-methylpropionamido)phenyl 2-chloroethylcarbamate m-(3-Methylbutyramido)phenyl methylcarbamate m-( 3-Methylbutyramido)phenyl diethylcarbamate m-( 3-Methylbutyramido)phenyl tert-butylcarbamate m-(3-Methylbutyramido)phenyl 2-chloroethylcarbamate m-(2,2-Diethylacetamido)phenyl methylcarbamate m-( 2,2-Diethylacetamido )phenyl isopropylcarbamate m-( 2,2-Diethylacetamido)phenyl tertbutylcarbamate m-(2,2-Diethylacetamido)phenyl 2-chloroethylcarbamate m-l-leptanamidophenyl methylcarbamate m-Heptanamidophenyl tert-butylcarbamate m-( 2-Pentenamido)phenyl tert-butylcarbamate It is clear that the classes of m-amidophenyl carbamates described and illustrated herein are characterized by herbicidal activity, and that the degree of this activity varies among specific compounds within these classes and to some extent among the species of plant to which these compounds may be applied. Thus, selection of a specific herbicidal compound to control undesirable plant species without injury to a desired crop species may readily be made.

Especially good results have been attained by the use of m-propionamidophenyl 2-chloroethylcarbamate as a post-emergence herbicide for use in controlling weed grasses (barnyard grass, crabgrass) and broad-leaved weeds (mustard, lambsquarters, pigweed and chickweed) in legumes (alfalfa, clover, lespedeza, etc.) at a dosage of, for example, one pound per acre.

The active herbicidal compounds of this invention may be formulated and/or applied with insecticides, fungicides, nematocides, plant growth regulators, fertilizers, and other agricultural chemicals and may be used as effective soil sterilants as well as in herbicidal applications. In applying an active compound of this invention, whether formulated alone or with other agricultural chemicals, an effective amount and concentration of the m-amidopheriyl N-substituted-carbamate is of course employed.

This application is a continuation-in-part of our application Ser. No. 496,159 filed Oct. 14, 1965.

It is apparent that various modifications may be made in the formulation and application of the novel compounds of this invention, without departing from the inventive concepts herein, as defined in the following claims:

We claim:

1. A compound of the formula where R is hydrogen or lower alkyl and R A and R are selected from the group consisting of cycloalkyl of 3 to 6 carbon atoms and aliphatic hydrocarbon containing up to about 6 catenated carbon atoms which may be substituted with chlorine or lower alkyl groups.

2. Compounds as in claim 1 in which R and R are each an aliphatic hydrocarbon radical of up to about 6 catenated carbon atoms.

3. Compounds as in claim 2 in which R is hydrogen or methyl.

4. Compounds as in claim 3 in which is the residue of a carboxylic acid in which the alpha carbon carries a methyl group.

5. Compounds as in claim 3 in which is the residue of a carboxylic acid in which the alpha carbon is part of a cyclopropyl ring.

6. Compounds as in claim 3 in which R is alkenyl.

7. Compounds as in claim 3 in which R is a lpropenyl radical.

8. Compounds as in claim 3 in which R, is ethyl.

9. Compounds as in claim 3 in which R, is 2- methybutyl.

10. The compound as set forth in claim 3 in which R is hydrogen, R is cyclopropyl and R is t-butyl.

l1. Compounds as in claim 8 in which R is hydrogen and R is isopropyl.

12. Compounds as in claim 8 in which R is hydrogen and R,, is sec-butyl.

l3. Compounds as in claim 8 in which R is hydrogen and R is 2-chloroethyl.

l4. Compounds as in claim 8 in which R is hydrogen and R is ethyl.

15. Compounds as in claim 8 in which R is hydrogen and R is propyl.

16. The compound as in claim 3 in which R is hydrogen, R is l-methyl propyl and R is methyl.

17. The compound as in claim 3 in which R is hydrogen, R is l-methylbutyl and R is methyl.

18. The compound as in claim 3 in which R is hydrogen, R is tert-butyl and R is methyl.

19. The compound as in claim 3 in which R is hydrogen, R is l-methylbutyl and R is tert-butyl.

20. The compound in claim 3 in which R is hydrogen, R is l-methylbutyl and R is isopropyl.

21. The compound as in claim 3 in which R is hydrogen, R is isopropenyl and R is methyl.

22. The compound as in claim 3 in which R is hydrogen, R is l-methyl-l-butenyl and R is methyl.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO. 1 3 876 684 DATED April 8 1975 |NVENTOR(5) 1 Kenneth L. Hill and Kenneth R. Wilson It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 2, line 16, "isorpopyl" should read "isopropyl".

Column 2, line 47, for "of secondary amine" read "or secondary amine".

Column 3, line 7, "yeild" should read "yield".

Column 14, line 14, "Found: C 60.47" should read "Found: C 60.87".

Column 20, line 6, "methylcarbamidates" should read "methylcarbamate" Column 22, line 18, "diisopropylearbamate" should read "diisopropylcarbamate".

Column 22, line 32, 'a and should read "and".

Column 23, line 25, "H 6.15" should read "H 6.16".

Column 24, line 12, "carab" should read "crab".

Column 26, line 18, "75 percent of flax" should read "75 percent kill of flax".

Column 26, line 61, "M 0" should read "H O" Column 27, line 67-8, 2-chloroethylcarbc 1nate" should read "2chloroethylcarbamate" Column 28 line 15, "M-Crotonamidophenyl" should read "m-Crotonamidophenyl" Column 29 line 48 "methylpropionamide) should read "methylpropionamido) Column 29 line 66 "m-Heptanamidophenyl methylcarbamate" should form another line.

Signed and Scaled this fifteenth D3) of June 1976 [sen] Arrest:

RUTH C. MASON C. MARSHALL DANN Arresting ()fficer Commissioner nfIarems and Trademarks 

1. A COMPOUND OF THE FORMULA
 2. Compounds as in claim 1 in which R.sub.A and R.sub.B are each an
 4. Compounds as in claim 3 in which
 5. Compounds as in claim 3 in which
 10. The compound as set forth in claim 3 in which R.sub.C is hydrogen,
 11. Compounds as in claim 8 in which R.sub.C is hydrogen and R.sub.B is
 12. Compounds as in claim 8 in which R.sub.C is hydrogen and R.sub.B is
 13. Compounds as in claim 8 in which R.sub.C is hydrogen and R.sub.B is
 14. Compounds as in claim 8 in which R.sub.C is hydrogen and R.sub.B is
 15. Compounds as in claim 8 in which R.sub.C is hydrogen and R.sub.B is
 16. The compound as in claim 3 in which R.sub.C is hydrogen, R.sub.A is
 17. The compound as in claim 3 in which R.sub.C is hydrogen, R.sub.A is
 18. The compound as in claim 3 in which R.sub.C is hydrogen, R.sub.A is
 19. The compound as in claim 3 in which R.sub.C is hydrogen, R.sub.A is
 20. The compound in claim 3 in which R.sub.C is hydrogen, R.sub.A is
 21. The compound as in claim 3 in which R.sub.C is hydrogen, R.sub.A is
 22. The compound as in claim 3 in which R.sub.C is hydrogen, R.sub.A is 1-methyl-1-butenyl and R.sub.B is methyl. 